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tcp port 0

Hi, ipaudit is reporting traffic on port 0 on a server zone I am monitoring. I ran a tcpdump for about 12 hours and there were no results at all. How can ipaudit report traffic on port 0 and not tcpdump. Here is the command: tcpdump -nnvvi bond0 'tcp[0:2] = 0' or 'tcp[2:2] = 0' -w tcpdump-port0 &